Unable to contact telephonically and e-mail

Sent a parcel from the SA Post Office on 10/8/2022 via Speed Services Couriers to be delivered to a business in Johannesburg (counter to door). To date 22/8/2022 i am unable to contact them to trace the whereabouts of my parcel. I tried their phone numbers ***; Customer Care ***; Track and Trace *** on numerous occassions and each time i was told that the number does not exist.I even tried sending e-mails to them and the SA Post Office without any response.